From: Bongkyu Kim Date: Wed, 20 Jan 2016 23:01:08 +0000 (-0800) Subject: lz4: fix wrong compress buffer size for 64-bits X-Git-Tag: v4.5-rc1~30^2~46 X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=06af1c52c9ea234e0b1266cc0b52c3e0c6c8fe9f;p=linux.git lz4: fix wrong compress buffer size for 64-bits The current lz4 compress buffer is 16kb on 32-bits, 32kb on 64-bits system. But, lz4 needs only 16kb on both. On 64-bits, this causes wasted cpu cycles for additional memset during every compression. In case of lz4hc, the current buffer size is (256kb + 8) on 32-bits, (512kb + 16) on 64-bits. But, lz4hc needs only (256kb + 2 * pointer) on both. This patch fixes these wrong compress buffer sizes for 64-bits. Signed-off-by: Bongkyu Kim Cc: Chanho Min Cc: Yann Collet Cc: Kyungsik Lee Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/include/linux/lz4.h b/include/linux/lz4.h index 4356686b0a39..6b784c59f321 100644 --- a/include/linux/lz4.h +++ b/include/linux/lz4.h @@ -9,8 +9,8 @@ * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ -#define LZ4_MEM_COMPRESS (4096 * sizeof(unsigned char *)) -#define LZ4HC_MEM_COMPRESS (65538 * sizeof(unsigned char *)) +#define LZ4_MEM_COMPRESS (16384) +#define LZ4HC_MEM_COMPRESS (262144 + (2 * sizeof(unsigned char *))) /* * lz4_compressbound()